LAS VEGAS, NV - MAY 05: (L-R) Canelo Alvarez throws a left to the body of Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (L-R) Canelo Alvarez throws a left to the body of Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (R-L) Shane Mosley throws a right as Canelo Alvarez ducks under during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (R-L) Canelo Alvarez throws a right at Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (L-R) Canelo Alvarez lands a punch as Shane Mosley is knocked back during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (R-L) Canelo Alvarez lands a right to the face of Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: (L-R) Canelo Alvarez throws a left to the head of Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 05: Canelo Alvarez is worked on by his cut man in his corner after the second round against Shane Mosley during their WBC super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 04: WBC super welterweight champion Saul Alvarez (L) and Shane Mosley pose during the official weigh-in for their bout at the MGM Grand Garden Arena on May 4, 2012 in Las Vegas, Nevada. Alvarez will defend his title against Mosley on May 5, 2012 in Las Vegas. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 04: WBC super welterweight champion Saul Alvarez poses after weighing in at 154 pounds during the official weigh-in for his bout against Shane Mosley at the MGM Grand Garden Arena on May 4, 2012 in Las Vegas, Nevada. Alvarez will defend his title against Mosley on May 5, 2012 in Las Vegas. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 04: WBC super welterweight champion Saul Alvarez (L) and Shane Mosley face off during the official weigh-in for their bout at the MGM Grand Garden Arena on May 4, 2012 in Las Vegas, Nevada. Alvarez will defend his title against Mosley on May 5, 2012 in Las Vegas. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - MAY 04: WBC super welterweight champion Saul Alvarez (L) and Shane Mosley face off during the official weigh-in for their bout at the MGM Grand Garden Arena on May 4, 2012 in Las Vegas, Nevada. Alvarez will defend his title against Mosley on May 5, 2012 in Las Vegas. (Photo by Al Bello/Getty Images)

Shane Mosley poses during the official weigh-in for his bout against WBC super welterweight champion Saul Alvarez at the MGM Grand Garden Arena on May 4, 2012 in Las Vegas, Nevada. Mosley will challenge Alvarez for his title on May 5, 2012 in Las Vegas.